Find the mean of the following frequency distribution using stepdeviation method: \begin{tabular...

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Find the mean of the following frequency distribution using stepdeviation method:
\begin{tabular}{|c|c|c|c|c|c|c|}
\hline Class & \( 84-90 \) & \( 90-96 \) & \( 96-102 \) & \( 102-108 \) & \( 108-114 \) & \( 114-120 \) \\
\hline Frequency & 15 & 22 & 20 & 18 & 20 & 25 \\
\hline
\end{tabular}
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